from machine import Pin, Timer
import time

led = Pin(0, Pin.OUT)
boton = Pin(16, Pin.IN, Pin.PULL_UP)

tim1 = Timer()

def tempo1(tim1):
    led.toggle()

def fun_boton(boton):
    if boton.value() == 0:
        led.on()
        tim1.init(freq=5, mode=Timer.PERIODIC, callback=tempo1)
    else:
        led.off()
        tim1.deinit()

boton.irq(trigger=Pin.IRQ_FALLING | Pin.IRQ_RISING, handler=fun_boton)

while True:
    pass